Symptoms of attention deficit hyperactivity disorder usually first appear between the ages of 3 and 6.

Causes

The exact cause of attention deficit hyperactivity disorder is not fully understood, although a combination of factors is thought to be responsible, such as – genetics, environmental factors, nutrition, brain injuries, and social environment.

#4 Will Smith

He is an American rapper and actor who was born and raised in Wynnefield section of Philadelphia. While still too young to drink legally, Will released a few platinum rap albums and won the 1st-ever Grammy Award given in the rap category.

While he wasn’t diagnosed as a child, Will Smith says he would have been diagnosed with attention-deficit/hyperactivity disorder if he were growing up today.

#5 Howie Mandel

American comedian, actor, and television personality, Howie is best known for hosting ”Deal or No Deal,” creating the cartoon series ”Bobby’s World,” and being a judge on ”America’s Got Talent.”

Mandel has both obsessive-compulsive disorder and ADHD.

Howie Mandel wrote for ADDitude magazine – “Back in the 1960s, when I was growing up, my symptoms didn’t have a name and you didn’t go to the doctor to find out. So, in my case, they were called ‘Howie Mandel.’”

#6 Solange Knowles

She is the younger sister of performer Beyoncé and a Grammy Award-winning R&B singer-songwriter.

Solange Knowles said she was diagnosed with the disorder twice before she believed it. “I didn’t believe the first doctor who told me. I guess I was in denial,” she said during an interview.

#8 Jim Carrey

He is a Canadian-American comedian, singer, actor, and writer who has begun stand-up comedy in 1979, performing at Yuk Yuk’s in Toronto, Ontario. Jim has received 2 Golden Globe Awards and has also been nominated on 4 occasions.

Jim Carrey has been open about his attention-deficit/hyperactivity disorder. Currently, he uses his celebrity status to bring attention to the problem.

#9 Adam Levine

He is an American songwriter, singer, and actor. Adam is the lead singer for Maroon 5, a pop-rock band. Levine met his future bandmates, Mickey Madden and Jesse Carmichael while attending Brentwood School.

“ADHD isn’t a bad thing, and you shouldn’t feel different from those without ADHD. Remember that you are not alone. There are others going through the same thing.” – Adam Levine said.

#10 Glenn Beck

Image credit – https://www.flickr.com/photos/gageskidmore/25564659871

He is an American conservative political commentator, television producer, and radio host. Glenn is the founder, CEO, and owner of Mercury Radio Arts, the parent company of his radio and television network TheBlaze.

“I believe that my success in business is because I can process a million things at a time and move very rapidly, but my failure at home is because of ADD,” Glenn Beck said.

His teachers complained about his inability to sit still until the 5th grade. Thereafter, the family physician diagnosed him with attention-deficit/hyperactivity disorder and informed his parents about this condition. At age 9, he went on Ritalin.

#13 Simone Biles

She is an American artistic gymnast who was part of the gold-medal-winning team dubbed the “Final Five” at the 2016 Summer Olympics in Rio de Janeiro. Furthermore, she is the 2016 Olympic individual all-around, vault and floor gold medalist.

“Having ADHD, and taking medicine for it is nothing to be ashamed of nothing that I’m afraid to let people know,” Simone Biles tweeted last year.

#14 Karina Smirnoff

She is an American professional ballroom dancer of Greek and Russian origins. Karina won the thirteenth season of Dancing with the Stars, with soap opera star J. R. Martinez.

Smirnoff told The Saturday Evening Post – “As a professional dancer, I’ve become known for my moves and my career accomplishments, but most people don’t know about another part of my life — I’m an adult with ADHD.”

#15 Justin Timberlake

He is one of the most popular successful singers across the world. Justin rose to fame as the lead singer of the boy band ‘N Sync’, that is considered the 3rd best-selling boy band in the music industry.

“I have OCD mixed with ADD. You try living with that [combination],” Justin Timberlake said.

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